chore(backlog): 记录 g54 完成

.ua/backlog.json

@@ -788,6 +788,14 @@
       "acceptance": "新增 tour（返回 {el,start,close} 句柄、按选择器聚光、卡片自动选方位、滚动重算、末步完成/跳过区分回调、Esc 入栈、焦点归还）；manifest/docs/demo/README/计数同步；npm run check 全绿",
       "status": "done",
       "notes": "自补：组件补充；聚光用超大 box-shadow 挖洞，省掉独立遮罩层"
+    },
+    {
+      "id": "g54",
+      "title": "新增 watermark 水印组件",
+      "motivation": "内部系统的防截图外传诉求没有落地件；水印颜色必须能跟随暗色主题，所以要从 --ua-* 令牌解析出实色再喂给 canvas",
+      "acceptance": "新增 watermark(props, ...children)（canvas 平铺单元、令牌色解析、多行/旋转/间距可配、覆盖层 pointer-events:none）；manifest/docs/demo/README/计数同步；npm run check 全绿",
+      "status": "done",
+      "notes": "自补：组件补充；canvas 不认 CSS 变量，先 getComputedStyle 解析"
     }
   ]
 }

.ua/iterations.log

@@ -98,3 +98,4 @@
 {"ts":"2026-10-26T12:15:04+08:00","id":"g51","result":"done","commit":"b93b6dd","summary":"新增 backTop 返回顶部：阈值浮现+conic 进度环+平滑回顶（尊重 reduced-motion）+内滚容器支持，组件数 49→50"}
 {"ts":"2026-10-26T12:16:11+08:00","id":"g52","result":"done","commit":"81ea189","summary":"新增 colorPicker：预设色板（缺省语义令牌色）+原生取色器+手输 CSS 颜色串，组件数 50→51"}
 {"ts":"2026-10-26T12:17:23+08:00","id":"g53","result":"done","commit":"697d354","summary":"新增 tour 引导漫游：聚光挖洞+卡片自动选方位+滚动重算+完成/跳过回调+Esc 入栈，组件数 51→52"}
+{"ts":"2026-10-26T12:18:24+08:00","id":"g54","result":"done","commit":"818e20e","summary":"新增 watermark：canvas 平铺单元+令牌色解析+多行旋转间距可配+覆盖层交互穿透，组件数 52→53"}